Dropbox is a utility that allows you to store files online and share them.

It also has synchronization capabilities between your own file repository and making it available online.

It is very simple to use: you simply designate a folder on your computer to be the folder where you "drop" your files. Once files are placed into that folder, they will automatically be synchronized with your Dropbox account and appear online to be shared with others. This has useful applications for backups as well as version control.

Dropbox boasts its security by saying: "all files are transported over SSL and encrypted using AES-256 (banks use this too)."